Then they can pick out a tiny city-state on the map! Altarrin ends up suggesting Aksell – a small but unusually densely-settled polity, landbound, only a few hundred miles south of the current Eastern Empire's borders, but separated by enough stateless territory mainly settled by nomadic tribes that the Empire has no particular trade relationship with it. If anyone gets curious enough to check the court archives, the records mention Aksell as having a number of semi-secretive mage-schools, and with a reputation that (to Eastern Empire sensibilities) hints at the existence of more genuinely-secret schools.
Relative to the Eastern Empire, it's a very religious place, with a couple of different competing temple orders. Altarrin very much doubts that anyone would think to ask Carissa which god she worshipped, and even if they did she could claim that her particular mage-school wasn't affiliated, but if she wants to be definitely prepared for questions, she should probably have some kind of opinion on the main orders?
The most popular one, according to his most-recent 150-year-old records, worships Anraethae, who - like Vkandis - is a fire-associated god, but who seems overall less interventionist, and definitely less violently so. There are a lot of philosophical texts about the purifying nature of fire, including (one assumes metaphorically) in a spiritual sense. Their priests believe strongly in redemption, for any beings including the more intelligent types of Abyssal demons. Altarrin's notes mentioned, via a second-hand rumor, that the order possesses a particular mage-ritual that can bind even the most powerful elemental and Abyssal entities into vulnerable material-plane bodies, so that the temple priests can work with them and convince them to repent.
...To be clear, Altarrin isn't sure this ritual exists, though it sounds feasible in theory, and he has no idea if this has ever actually happened and somewhat doubts it. It sounds like a very questionable idea.